Wendy McFadden-Smith explores Leafroll virus in Niagara, Ontario.
Virus diseases, particularly those caused by grapevine leafroll associated virus (GLRaV) and grapevine red blotch-associated virus (GRBaV), are a serious threat in all Canadian wine producing provinces due to their rapid spread ans severe impact on grape and wine production and quality. Activities 2, 3 and 4 of the Grape and Wine Science Cluster will determine the incidence of virus infections in Canada, the role insect vectors and their control play in infection spread, and the virus impacts on grape yield and quality. The results from this research will serve to develop strategies to control vectors, mitigate infection impacts to wine quality, and reduce infections in the long-term through adoption of a national clean plant program. Analytical services for the virus-related projects will be provided by the Cool Climate Oenology and Viticulture Institute (CCOVI) at Brock University.
This comprehensive 114-page guide, available as a free download in English and French, was created in a field-sized format to help growers identify the pests in their vineyards and make informed decisions about how to best protect their grapes. Better understanding the numerous beneficial insects present in the vineyard will enable them to produce grapes sustainably and reduce their reliance on chemical interventions.
Sudarsana Poojari of CCOVI and Jill Page of CGCN presented an update on Grapevine Virus at the 2019 Ontario Craft Wine Conference & Trade Show.
PhD candidate Elizabeth Cieniewicz and plant pathology Professor Marc Fuchs discuss their research looking at the virus associated with Red Blotch Disease, how it spreads among vines, and the implications for management.
Typical symptoms of Leafroll disease in red cultivars include red-purple discoloration, and rolling backwards of the leaves. In white varietals, this is not as prevalent, although can sometimes be seen closer to the end of the growing season.